Research And Development Of Flowmeter Automatic Calibrating Device

With the constant development of science and technology, the application of the technology of the computer and micro electronic device is more and more extensive On this basis, There is leap of the quality on the accuracy, sensitivity, dependability and automatic degree, therefore has put forward higher request to the demarcating standard device of the flow.Hebei Hong Ye Co., Ltd. had a set of static volume laws to assay and fit originally,but the control system lagged behind and the dependabiling is not high, that cann't meet the demand for production development, so they have put forward the request for automatic transformation. The paper has carried on detailed analysis to the examination principle of calibrating the standard device of the flow on the basis of consulting about the list of references both at home and abroad, and designed several sets of schemes of calibrating. In case of considering the economy and precision and combining the actual conditions of the device, the systematic design frame of the static volume flow meter is brought forward.After demanding to analyse in an all-round way in calibrating the systematic function in the article, we have confirmed systematic input and output relation and have designed the scheme of assaying. The system regards industrial control computer as the core, adopts Labview developing platform under windows platform in the software; controls the executive machine and collects different signal that flow meter output through the mutual information between the multi-function data collecting card and control circuit board.The technological difficult point of system has three points mainly, first, as calibrating device, the precision is the most crucial index. The influencing various kinds of factors of the precision are analysed in the article, error to reversing and synchronous measuring is discussed especially; second, as calibrating device works at the industrial scene, working environment is more abominable, the systematic stability and dependability are needed to analyse and prove; third, this system reconstructs on the basis of original device, so must consider the economy of the system according to the request of Hebei Hong Ye Co., Ltd.The result is proved: Static volume law flow meter that the paper put forward is to realize flow instrument automatic and standard systematically to calibration, and all met the requirement of Hebei Hong Ye Co., Ltd. on technically , economy at the same time.